The material for micromilling are mainly calcium carbonates, and we usually measure the isotope ratio after micromilling. For the isotope measurement, it is important to know the composition of carboante, i.e., high-Mg calcite, low-Mg calcite, aragonite and dolomite.
- ♦ We have developed a highly sensitive method for quantifying the compositions of carbonate mineral crystals using terahertz time-domain spectroscopy.
♦ The method is capable of generating observations with even greater sensitivity than traditional x-ray-based analyses and is able to determine carbonate mineral composition (i.e., crystal polymorphs), such as low-Mg calcite.
♦ The technique is promising for generating new methods of assessing the degree of mineral alteration of coral skeletons, which are used as important records of past marine environments.
Link to the detailed information: http://www.jamstec.go.jp/e/about/press_release/20190207/